Mostly I added my comments only to back up your theory. I wouldn't even have mentioned a noise issue otherwise because they've never been anything but silent for me (minus any rattling from the powerheads anyhow, but that's usually solveable with a new impeller, the powerhead bodies seem to outlive the impellers easily 10 to 1).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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